<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <style type="text/css">
        html body
        {
            margin: 0px;
            padding: 0px;
        }
        #parent
        {
            width: 200px;
            height: 200px;
            border: solid 5px black;
            padding: 0px;
            position: relative;
            background-color: green;
            top: 15px;
            left: 15px;
        }
        #sub1
        {
            width: 100px;
            height: 100px;
			position: relative;
            background-color: blue;
			top: 15px;
			left: 15px;
        }
        #sub2
        {
            width: 100px;
            height: 100px;
            background-color: red;
        }
    </style>
</head>
<body>
    <div id="parent">
        <div id="sub1">
        </div>
        <div id="sub2">
        </div>
    </div>
</body>
</html>